martin_altmann Posted June 17, 2005 Share Posted June 17, 2005 I have a set of slides taken back in 1998 with my Nikon F401 camera mostly taken with my then new 24 mm Nikkor lens. Unfortunately I was using two filters - being unaware that this causes vignette (well of course I know about the principal problem but the viewfinder did not show any - it hasn't got 100% - the 35-70 kit lens did not show vignette with two filters (UV+Cpol)). So many of those pics ended up with having quite severe vignette effects. Some of these have been scanned by me in the meantime, now I'm looking for a way to correct this flaw using my standard software GIMP. Since I right now have access to LINUX only PS is not an option. Searching the internet I found many tips on how to add a vignette to a picture with GIMP, but that is not what I wanted, i want to flatten my vignetted pics - no information found. If anybody knows how to do it under GIMP, I would be glad if you could share this information. Thanks. Link to comment Share on other sites More sharing options...
matti_koskinen Posted June 17, 2005 Share Posted June 17, 2005 You could try the panorama tools. You can download it from http://www.vierpi.de It's bit tricky to use, but can do amazing things. -matti Link to comment Share on other sites More sharing options...
beauh44 Posted June 17, 2005 Share Posted June 17, 2005 I think the same folks (Panorama Tools) make PTLens - I believe it's got a vignette-fixing feature. It's easy as pie - and free! Link to comment Share on other sites More sharing options...
mdickerson Posted June 17, 2005 Share Posted June 17, 2005 Hi Martin .. Here is what I just tried: Add a layer on top of your image, use the gradient tool to draw a radial black-to-white pattern on it, then change the layer blending mode to "Burn", and you will get an effect that lightens the edges of the frame. This is crude but it is a place to start, and you can probably get what you want by experimenting with the other blending modes and maybe reducing the later opacity. Of course if the vignetting is so bad that the pixels outside the circle are just black, there's nothing you can do but crop them out. Nice to see there are other Gimp-y people out there.. Link to comment Share on other sites More sharing options...
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